Full-duplex turbo HARQ-ACK

ABSTRACT

A UE may transmit, to a base station, and the base station may receive, from the UE, a turbo HARQ-ACK message corresponding to a first downlink transmission. The turbo HARQ-ACK message may include an indication of a duplexing mode associated with a second downlink transmission. The base station may transmit, to the UE, and the UE may receive, from the base station, the second downlink transmission based on the indication of the duplexing mode. The indication of the duplexing mode may correspond to a full-duplex mode or a half-duplex mode. The first downlink transmission may correspond to a first TB. The second downlink transmission may correspond to a second TB. The turbo HARQ-ACK message may further indicate a requested delta MCS for the second downlink transmission with respect to an MCS associated with the first downlink transmission.

TECHNICAL FIELD

The present disclosure relates generally to communication systems, andmore particularly, to indication of a duplexing mode for a subsequenttransmission in a hybrid automatic repeat request (HARD)-acknowledgement(ACK) (HARQ-ACK) message in a wireless communication system.

INTRODUCTION

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources. Examples of suchmultiple-access technologies include code division multiple access(CDMA) systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. An example telecommunication standardis 5G New Radio (NR). 5G NR is part of a continuous mobile broadbandevolution promulgated by Third Generation Partnership Project (3GPP) tomeet new requirements associated with latency, reliability, security,scalability (e.g., with Internet of Things (IoT)), and otherrequirements. 5G NR includes services associated with enhanced mobilebroadband (eMBB), massive machine type communications (mMTC), andultra-reliable low latency communications (URLLC). Some aspects of 5G NRmay be based on the 4G Long Term Evolution (LTE) standard. There existsa need for further improvements in 5G NR technology. These improvementsmay also be applicable to other multi-access technologies and thetelecommunication standards that employ these technologies.

BRIEF SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all contemplated aspects, and is intendedto neither identify key or critical elements of all aspects nordelineate the scope of any or all aspects. Its sole purpose is topresent some concepts of one or more aspects in a simplified form as aprelude to the more detailed description that is presented later.

In an aspect of the disclosure, a method, a computer-readable medium,and an apparatus are provided. The apparatus may be a user equipment(UE). The apparatus may transmit, to a base station, a turbo HARQ-ACKmessage corresponding to a first downlink transmission. The turboHARQ-ACK message may include an indication of a duplexing modeassociated with a second downlink transmission. The apparatus mayreceive, from the base station, the second downlink transmission basedon the indication of the duplexing mode.

In an aspect of the disclosure, a method, a computer-readable medium,and an apparatus are provided. The apparatus may be a base station. Theapparatus may receive, from a UE, a turbo HARQ-ACK message correspondingto a first downlink transmission. The turbo HARQ-ACK message may includean indication of a duplexing mode associated with a second downlinktransmission. The apparatus may transmit, to the UE, the second downlinktransmission based on the indication of the duplexing mode.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network.

FIG. 2A is a diagram illustrating an example of a first frame, inaccordance with various aspects of the present disclosure.

FIG. 2B is a diagram illustrating an example of DL channels within asubframe, in accordance with various aspects of the present disclosure.

FIG. 2C is a diagram illustrating an example of a second frame, inaccordance with various aspects of the present disclosure.

FIG. 2D is a diagram illustrating an example of UL channels within asubframe, in accordance with various aspects of the present disclosure.

FIG. 3 is a diagram illustrating an example of a base station and userequipment (UE) in an access network.

FIG. 4 is a diagram illustrating a HARQ-ACK message corresponding to atransmission via a PDSCH.

FIG. 5 is a diagram of a communication flow of a method of wirelesscommunication.

FIG. 6 is a flowchart of a method of wireless communication.

FIG. 7 is a flowchart of a method of wireless communication.

FIG. 8 is a flowchart of a method of wireless communication.

FIG. 9 is a flowchart of a method of wireless communication.

FIG. 10 is a diagram illustrating an example of a hardwareimplementation for an example apparatus.

FIG. 11 is a diagram illustrating an example of a hardwareimplementation for an example apparatus.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of various configurations and isnot intended to represent the only configurations in which the conceptsdescribed herein may be practiced. The detailed description includesspecific details for the purpose of providing a thorough understandingof various concepts. However, it will be apparent to those skilled inthe art that these concepts may be practiced without these specificdetails. In some instances, well known structures and components areshown in block diagram form in order to avoid obscuring such concepts.

Several aspects of telecommunication systems will now be presented withreference to various apparatus and methods. These apparatus and methodswill be described in the following detailed description and illustratedin the accompanying drawings by various blocks, components, circuits,processes, algorithms, etc. (collectively referred to as “elements”).These elements may be implemented using electronic hardware, computersoftware, or any combination thereof. Whether such elements areimplemented as hardware or software depends upon the particularapplication and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or anycombination of elements may be implemented as a “processing system” thatincludes one or more processors. Examples of processors includemicroprocessors, microcontrollers, graphics processing units (GPUs),central processing units (CPUs), application processors, digital signalprocessors (DSPs), reduced instruction set computing (RISC) processors,systems on a chip (SoC), baseband processors, field programmable gatearrays (FPGAs), programmable logic devices (PLDs), state machines, gatedlogic, discrete hardware circuits, and other suitable hardwareconfigured to perform the various functionality described throughoutthis disclosure. One or more processors in the processing system mayexecute software. Software shall be construed broadly to meaninstructions, instruction sets, code, code segments, program code,programs, subprograms, software components, applications, softwareapplications, software packages, routines, subroutines, objects,executables, threads of execution, procedures, functions, etc., whetherreferred to as software, firmware, middleware, microcode, hardwaredescription language, or otherwise.

Accordingly, in one or more example embodiments, the functions describedmay be implemented in hardware, software, or any combination thereof. Ifimplemented in software, the functions may be stored on or encoded asone or more instructions or code on a computer-readable medium.Computer-readable media includes computer storage media. Storage mediamay be any available media that can be accessed by a computer. By way ofexample, and not limitation, such computer-readable media can comprise arandom-access memory (RAM), a read-only memory (ROM), an electricallyerasable programmable ROM (EEPROM), optical disk storage, magnetic diskstorage, other magnetic storage devices, combinations of the types ofcomputer-readable media, or any other medium that can be used to storecomputer executable code in the form of instructions or data structuresthat can be accessed by a computer.

While aspects and implementations are described in this application byillustration to some examples, those skilled in the art will understandthat additional implementations and use cases may come about in manydifferent arrangements and scenarios. Innovations described herein maybe implemented across many differing platform types, devices, systems,shapes, sizes, and packaging arrangements. For example, implementationsand/or uses may come about via integrated chip implementations and othernon-module-component based devices (e.g., end-user devices, vehicles,communication devices, computing devices, industrial equipment,retail/purchasing devices, medical devices, artificial intelligence(AI)-enabled devices, etc.). While some examples may or may not bespecifically directed to use cases or applications, a wide assortment ofapplicability of described innovations may occur. Implementations mayrange a spectrum from chip-level or modular components to non-modular,non-chip-level implementations and further to aggregate, distributed, ororiginal equipment manufacturer (OEM) devices or systems incorporatingone or more aspects of the described innovations. In some practicalsettings, devices incorporating described aspects and features may alsoinclude additional components and features for implementation andpractice of claimed and described aspect. For example, transmission andreception of wireless signals necessarily includes a number ofcomponents for analog and digital purposes (e.g., hardware componentsincluding antenna, RF-chains, power amplifiers, modulators, buffer,processor(s), interleaver, adders/summers, etc.). It is intended thatinnovations described herein may be practiced in a wide variety ofdevices, chip-level components, systems, distributed arrangements,aggregated or disaggregated components, end-user devices, etc. ofvarying sizes, shapes, and constitution.

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network 100. The wireless communications system(also referred to as a wireless wide area network (WWAN)) includes basestations 102, UEs 104, an Evolved Packet Core (EPC) 160, and anothercore network 190 (e.g., a 5G Core (5GC)). The base stations 102 mayinclude macrocells (high power cellular base station) and/or small cells(low power cellular base station). The macrocells include base stations.The small cells include femtocells, picocells, and microcells.

The base stations 102 configured for 4G LTE (collectively referred to asEvolved Universal Mobile Telecommunications System (UMTS) TerrestrialRadio Access Network (E-UTRAN)) may interface with the EPC 160 throughfirst backhaul links 132 (e.g., S1 interface). The base stations 102configured for 5G NR (collectively referred to as Next Generation RAN(NG-RAN)) may interface with core network 190 through second backhaullinks 184. In addition to other functions, the base stations 102 mayperform one or more of the following functions: transfer of user data,radio channel ciphering and deciphering, integrity protection, headercompression, mobility control functions (e.g., handover, dualconnectivity), inter-cell interference coordination, connection setupand release, load balancing, distribution for non-access stratum (NAS)messages, NAS node selection, synchronization, radio access network(RAN) sharing, multimedia broadcast multicast service (MBMS), subscriberand equipment trace, RAN information management (RIM), paging,positioning, and delivery of warning messages. The base stations 102 maycommunicate directly or indirectly (e.g., through the EPC 160 or corenetwork 190) with each other over third backhaul links 134 (e.g., X2interface). The first backhaul links 132, the second backhaul links 184,and the third backhaul links 134 may be wired or wireless.

The base stations 102 may wirelessly communicate with the UEs 104. Eachof the base stations 102 may provide communication coverage for arespective geographic coverage area 110. There may be overlappinggeographic coverage areas 110. For example, the small cell 102′ may havea coverage area 110′ that overlaps the coverage area 110 of one or moremacro base stations 102. A network that includes both small cell andmacrocells may be known as a heterogeneous network. A heterogeneousnetwork may also include Home Evolved Node Bs (eNBs) (HeNBs), which mayprovide service to a restricted group known as a closed subscriber group(CSG). The communication links 120 between the base stations 102 and theUEs 104 may include uplink (UL) (also referred to as reverse link)transmissions from a UE 104 to a base station 102 and/or downlink (DL)(also referred to as forward link) transmissions from a base station 102to a UE 104. The communication links 120 may use multiple-input andmultiple-output (MIMO) antenna technology, including spatialmultiplexing, beamforming, and/or transmit diversity. The communicationlinks may be through one or more carriers. The base stations 102/UEs 104may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz)bandwidth per carrier allocated in a carrier aggregation of up to atotal of Yx MHz (x component carriers) used for transmission in eachdirection. The carriers may or may not be adjacent to each other.Allocation of carriers may be asymmetric with respect to DL and UL(e.g., more or fewer carriers may be allocated for DL than for UL). Thecomponent carriers may include a primary component carrier and one ormore secondary component carriers. A primary component carrier may bereferred to as a primary cell (PCell) and a secondary component carriermay be referred to as a secondary cell (SCell).

Certain UEs 104 may communicate with each other using device-to-device(D2D) communication link 158. The D2D communication link 158 may use theDL/UL WWAN spectrum. The D2D communication link 158 may use one or moresidelink channels, such as a physical sidelink broadcast channel(PSBCH), a physical sidelink discovery channel (PSDCH), a physicalsidelink shared channel (PSSCH), and a physical sidelink control channel(PSCCH). D2D communication may be through a variety of wireless D2Dcommunications systems, such as for example, WiMedia, Bluetooth, ZigBee,Wi-Fi based on the Institute of Electrical and Electronics Engineers(IEEE) 802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi accesspoint (AP) 150 in communication with Wi-Fi stations (STAs) 152 viacommunication links 154, e.g., in a 5 GHz unlicensed frequency spectrumor the like. When communicating in an unlicensed frequency spectrum, theSTAs 152/AP 150 may perform a clear channel assessment (CCA) prior tocommunicating in order to determine whether the channel is available.

The small cell 102′ may operate in a licensed and/or an unlicensedfrequency spectrum. When operating in an unlicensed frequency spectrum,the small cell 102′ may employ NR and use the same unlicensed frequencyspectrum (e.g., 5 GHz, or the like) as used by the Wi-Fi AP 150. Thesmall cell 102′, employing NR in an unlicensed frequency spectrum, mayboost coverage to and/or increase capacity of the access network.

The electromagnetic spectrum is often subdivided, based onfrequency/wavelength, into various classes, bands, channels, etc. In 5GNR, two initial operating bands have been identified as frequency rangedesignations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz).Although a portion of FR1 is greater than 6 GHz, FR1 is often referredto (interchangeably) as a “sub-6 GHz” band in various documents andarticles. A similar nomenclature issue sometimes occurs with regard toFR2, which is often referred to (interchangeably) as a “millimeter wave”band in documents and articles, despite being different from theextremely high frequency (EHF) band (30 GHz-300 GHz) which is identifiedby the International Telecommunications Union (ITU) as a “millimeterwave” band.

The frequencies between FR1 and FR2 are often referred to as mid-bandfrequencies. Recent 5G NR studies have identified an operating band forthese mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25 GHz). Frequency bands falling within FR3 may inherit FR1characteristics and/or FR2 characteristics, and thus may effectivelyextend features of FR1 and/or FR2 into mid-band frequencies. Inaddition, higher frequency bands are currently being explored to extend5G NR operation beyond 52.6 GHz. For example, three higher operatingbands have been identified as frequency range designations FR4a or FR4-1(52.6 GHz-71 GHz), FR4 (52.6 GHz-114.25 GHz), and FR5 (114.25 GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

With the above aspects in mind, unless specifically stated otherwise, itshould be understood that the term “sub-6 GHz” or the like if usedherein may broadly represent frequencies that may be less than 6 GHz,may be within FR1, or may include mid-band frequencies. Further, unlessspecifically stated otherwise, it should be understood that the term“millimeter wave” or the like if used herein may broadly representfrequencies that may include mid-band frequencies, may be within FR2,FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band.

A base station 102, whether a small cell 102′ or a large cell (e.g.,macro base station), may include and/or be referred to as an eNB, gNodeB(gNB), or another type of base station. Some base stations, such as gNB180 may operate in a traditional sub 6 GHz spectrum, in millimeter wavefrequencies, and/or near millimeter wave frequencies in communicationwith the UE 104. When the gNB 180 operates in millimeter wave or nearmillimeter wave frequencies, the gNB 180 may be referred to as amillimeter wave base station. The millimeter wave base station 180 mayutilize beamforming 182 with the UE 104 to compensate for the path lossand short range. The base station 180 and the UE 104 may each include aplurality of antennas, such as antenna elements, antenna panels, and/orantenna arrays to facilitate the beamforming.

The base station 180 may transmit a beamformed signal to the UE 104 inone or more transmit directions 182′. The UE 104 may receive thebeamformed signal from the base station 180 in one or more receivedirections 182″. The UE 104 may also transmit a beamformed signal to thebase station 180 in one or more transmit directions. The base station180 may receive the beamformed signal from the UE 104 in one or morereceive directions. The base station 180/UE 104 may perform beamtraining to determine the best receive and transmit directions for eachof the base station 180/UE 104. The transmit and receive directions forthe base station 180 may or may not be the same. The transmit andreceive directions for the UE 104 may or may not be the same.

The EPC 160 may include a Mobility Management Entity (MME) 162, otherMMEs 164, a Serving Gateway 166, a Multimedia Broadcast MulticastService (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC)170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be incommunication with a Home Subscriber Server (HSS) 174. The MME 162 isthe control node that processes the signaling between the UEs 104 andthe EPC 160. Generally, the MME 162 provides bearer and connectionmanagement. All user Internet protocol (IP) packets are transferredthrough the Serving Gateway 166, which itself is connected to the PDNGateway 172. The PDN Gateway 172 provides UE IP address allocation aswell as other functions. The PDN Gateway 172 and the BM-SC 170 areconnected to the IP Services 176. The IP Services 176 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a PS StreamingService, and/or other IP services. The BM-SC 170 may provide functionsfor MBMS user service provisioning and delivery. The BM-SC 170 may serveas an entry point for content provider MBMS transmission, may be used toauthorize and initiate MBMS Bearer Services within a public land mobilenetwork (PLMN), and may be used to schedule MBMS transmissions. The MBMSGateway 168 may be used to distribute MBMS traffic to the base stations102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN)area broadcasting a particular service, and may be responsible forsession management (start/stop) and for collecting eMBMS relatedcharging information.

The core network 190 may include an Access and Mobility ManagementFunction (AMF) 192, other AMFs 193, a Session Management Function (SMF)194, and a User Plane Function (UPF) 195. The AMF 192 may be incommunication with a Unified Data Management (UDM) 196. The AMF 192 isthe control node that processes the signaling between the UEs 104 andthe core network 190. Generally, the AMF 192 provides QoS flow andsession management. All user Internet protocol (IP) packets aretransferred through the UPF 195. The UPF 195 provides UE IP addressallocation as well as other functions. The UPF 195 is connected to theIP Services 197. The IP Services 197 may include the Internet, anintranet, an IP Multimedia Subsystem (IMS), a Packet Switch (PS)Streaming (PSS) Service, and/or other IP services.

The base station may include and/or be referred to as a gNB, Node B,eNB, an access point, a base transceiver station, a radio base station,a radio transceiver, a transceiver function, a basic service set (BSS),an extended service set (ESS), a transmit reception point (TRP), or someother suitable terminology. The base station 102 provides an accesspoint to the EPC 160 or core network 190 for a UE 104. Examples of UEs104 include a cellular phone, a smart phone, a session initiationprotocol (SIP) phone, a laptop, a personal digital assistant (PDA), asatellite radio, a global positioning system, a multimedia device, avideo device, a digital audio player (e.g., MP3 player), a camera, agame console, a tablet, a smart device, a wearable device, a vehicle, anelectric meter, a gas pump, a large or small kitchen appliance, ahealthcare device, an implant, a sensor/actuator, a display, or anyother similar functioning device. Some of the UEs 104 may be referred toas IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heartmonitor, etc.). The UE 104 may also be referred to as a station, amobile station, a subscriber station, a mobile unit, a subscriber unit,a wireless unit, a remote unit, a mobile device, a wireless device, awireless communications device, a remote device, a mobile subscriberstation, an access terminal, a mobile terminal, a wireless terminal, aremote terminal, a handset, a user agent, a mobile client, a client, orsome other suitable terminology. In some scenarios, the term UE may alsoapply to one or more companion devices such as in a device constellationarrangement. One or more of these devices may collectively access thenetwork and/or individually access the network.

Referring again to FIG. 1 , in certain aspects, the UE 104 may include aturbo HARQ-ACK component 198 that may be configured to transmit, to abase station, a turbo HARQ-ACK message corresponding to a first downlinktransmission. The turbo HARQ-ACK message may include an indication of aduplexing mode associated with a second downlink transmission. The turboHARQ-ACK component 198 may be configured to receive, from the basestation, the second downlink transmission based on the indication of theduplexing mode. In certain aspects, the base station 180 may include aturbo HARQ-ACK component 199 that may be configured to receive, from aUE, a turbo HARQ-ACK message corresponding to a first downlinktransmission. The turbo HARQ-ACK message may include an indication of aduplexing mode associated with a second downlink transmission. The turboHARQ-ACK component 198 may be configured to transmit, to the UE, thesecond downlink transmission based on the indication of the duplexingmode. Although the following description may be focused on 5G NR, theconcepts described herein may be applicable to other similar areas, suchas LTE, LTE-A, CDMA, GSM, and other wireless technologies.

FIG. 2A is a diagram 200 illustrating an example of a first subframewithin a 5G NR frame structure. FIG. 2B is a diagram 230 illustrating anexample of DL channels within a 5G NR subframe. FIG. 2C is a diagram 250illustrating an example of a second subframe within a 5G NR framestructure. FIG. 2D is a diagram 280 illustrating an example of ULchannels within a 5G NR subframe. The 5G NR frame structure may befrequency division duplexed (FDD) in which for a particular set ofsubcarriers (carrier system bandwidth), subframes within the set ofsubcarriers are dedicated for either DL or UL, or may be time divisionduplexed (TDD) in which for a particular set of subcarriers (carriersystem bandwidth), subframes within the set of subcarriers are dedicatedfor both DL and UL. In the examples provided by FIGS. 2A, 2C, the 5G NRframe structure is assumed to be TDD, with subframe 4 being configuredwith slot format 28 (with mostly DL), where D is DL, U is UL, and F isflexible for use between DL/UL, and subframe 3 being configured withslot format 1 (with all UL). While subframes 3, 4 are shown with slotformats 1, 28, respectively, any particular subframe may be configuredwith any of the various available slot formats 0-61. Slot formats 0, 1are all DL, UL, respectively. Other slot formats 2-61 include a mix ofDL, UL, and flexible symbols. UEs are configured with the slot format(dynamically through DL control information (DCI), orsemi-statically/statically through radio resource control (RRC)signaling) through a received slot format indicator (SFI). Note that thedescription infra applies also to a 5G NR frame structure that is TDD.

FIGS. 2A-2D illustrate a frame structure, and the aspects of the presentdisclosure may be applicable to other wireless communicationtechnologies, which may have a different frame structure and/ordifferent channels. A frame (10 ms) may be divided into 10 equally sizedsubframes (1 ms). Each subframe may include one or more time slots.Subframes may also include mini-slots, which may include 7, 4, or 2symbols. Each slot may include 14 or 12 symbols, depending on whetherthe cyclic prefix (CP) is normal or extended. For normal CP, each slotmay include 14 symbols, and for extended CP, each slot may include 12symbols. The symbols on DL may be CP orthogonal frequency divisionmultiplexing (OFDM) (CP-OFDM) symbols. The symbols on UL may be CP-OFDMsymbols (for high throughput scenarios) or discrete Fourier transform(DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as singlecarrier frequency-division multiple access (SC-FDMA) symbols) (for powerlimited scenarios; limited to a single stream transmission). The numberof slots within a subframe is based on the CP and the numerology. Thenumerology defines the subcarrier spacing (SCS) and, effectively, thesymbol length/duration, which is equal to 1/SCS.

SCS μ Δƒ = 2^(μ) · 15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 2 60Normal, Extended 3 120 Normal 4 240 Normal

For normal CP (14 symbols/slot), different numerologies μ 0 to 4 allowfor 1, 2, 4, 8, and 16 slots, respectively, per subframe. For extendedCP, the numerology 2 allows for 4 slots per subframe. Accordingly, fornormal CP and numerology μ, there are 14 symbols/slot and 2^(μ)slots/subframe. The subcarrier spacing may be equal to 2^(μ)*15 kHz,where μ is the numerology 0 to 4. As such, the numerology μ=0 has asubcarrier spacing of 15 kHz and the numerology μ=4 has a subcarrierspacing of 240 kHz. The symbol length/duration is inversely related tothe subcarrier spacing. FIGS. 2A-2D provide an example of normal CP with14 symbols per slot and numerology μ=2 with 4 slots per subframe. Theslot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and thesymbol duration is approximately 16.67 μs. Within a set of frames, theremay be one or more different bandwidth parts (BWPs) (see FIG. 2B) thatare frequency division multiplexed. Each BWP may have a particularnumerology and CP (normal or extended).

A resource grid may be used to represent the frame structure. Each timeslot includes a resource block (RB) (also referred to as physical RBs(PRBs)) that extends 12 consecutive subcarriers. The resource grid isdivided into multiple resource elements (REs). The number of bitscarried by each RE depends on the modulation scheme.

As illustrated in FIG. 2A, some of the REs carry reference (pilot)signals (RS) for the UE. The RS may include demodulation RS (DM-RS)(indicated as R for one particular configuration, but other DM-RSconfigurations are possible) and channel state information referencesignals (CSI-RS) for channel estimation at the UE. The RS may alsoinclude beam measurement RS (BRS), beam refinement RS (BRRS), and phasetracking RS (PT-RS).

FIG. 2B illustrates an example of various DL channels within a subframeof a frame. The physical downlink control channel (PDCCH) carries DCIwithin one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or16 CCEs), each CCE including six RE groups (REGs), each REG including 12consecutive REs in an OFDM symbol of an RB. A PDCCH within one BWP maybe referred to as a control resource set (CORESET). A UE is configuredto monitor PDCCH candidates in a PDCCH search space (e.g., common searchspace, UE-specific search space) during PDCCH monitoring occasions onthe CORESET, where the PDCCH candidates have different DCI formats anddifferent aggregation levels. Additional BWPs may be located at greaterand/or lower frequencies across the channel bandwidth. A primarysynchronization signal (PSS) may be within symbol 2 of particularsubframes of a frame. The PSS is used by a UE 104 to determinesubframe/symbol timing and a physical layer identity. A secondarysynchronization signal (SSS) may be within symbol 4 of particularsubframes of a frame. The SSS is used by a UE to determine a physicallayer cell identity group number and radio frame timing. Based on thephysical layer identity and the physical layer cell identity groupnumber, the UE can determine a physical cell identifier (PCI). Based onthe PCI, the UE can determine the locations of the DM-RS. The physicalbroadcast channel (PBCH), which carries a master information block(MIB), may be logically grouped with the PSS and SSS to form asynchronization signal (SS)/PBCH block (also referred to as SS block(SSB)). The MIB provides a number of RBs in the system bandwidth and asystem frame number (SFN). The physical downlink shared channel (PDSCH)carries user data, broadcast system information not transmitted throughthe PBCH such as system information blocks (SIBs), and paging messages.

As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as Rfor one particular configuration, but other DM-RS configurations arepossible) for channel estimation at the base station. The UE maytransmit DM-RS for the physical uplink control channel (PUCCH) and DM-RSfor the physical uplink shared channel (PUSCH). The PUSCH DM-RS may betransmitted in the first one or two symbols of the PUSCH. The PUCCHDM-RS may be transmitted in different configurations depending onwhether short or long PUCCHs are transmitted and depending on theparticular PUCCH format used. The UE may transmit sounding referencesignals (SRS). The SRS may be transmitted in the last symbol of asubframe. The SRS may have a comb structure, and a UE may transmit SRSon one of the combs. The SRS may be used by a base station for channelquality estimation to enable frequency-dependent scheduling on the UL.

FIG. 2D illustrates an example of various UL channels within a subframeof a frame. The PUCCH may be located as indicated in one configuration.The PUCCH carries uplink control information (UCI), such as schedulingrequests, a channel quality indicator (CQI), a precoding matrixindicator (PMI), a rank indicator (RI), and hybrid automatic repeatrequest (HARQ) acknowledgment (ACK) (HARQ-ACK) feedback (i.e., one ormore HARQ ACK bits indicating one or more ACK and/or negative ACK(NACK)). The PUSCH carries data, and may additionally be used to carry abuffer status report (BSR), a power headroom report (PHR), and/or UCI.

FIG. 3 is a block diagram of a base station 310 in communication with aUE 350 in an access network. In the DL, IP packets from the EPC 160 maybe provided to a controller/processor 375. The controller/processor 375implements layer 3 and layer 2 functionality. Layer 3 includes a radioresource control (RRC) layer, and layer 2 includes a service dataadaptation protocol (SDAP) layer, a packet data convergence protocol(PDCP) layer, a radio link control (RLC) layer, and a medium accesscontrol (MAC) layer. The controller/processor 375 provides RRC layerfunctionality associated with broadcasting of system information (e.g.,MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRCconnection establishment, RRC connection modification, and RRCconnection release), inter radio access technology (RAT) mobility, andmeasurement configuration for UE measurement reporting; PDCP layerfunctionality associated with header compression/decompression, security(ciphering, deciphering, integrity protection, integrity verification),and handover support functions; RLC layer functionality associated withthe transfer of upper layer packet data units (PDUs), error correctionthrough ARQ, concatenation, segmentation, and reassembly of RLC servicedata units (SDUs), re-segmentation of RLC data PDUs, and reordering ofRLC data PDUs; and MAC layer functionality associated with mappingbetween logical channels and transport channels, multiplexing of MACSDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs,scheduling information reporting, error correction through HARQ,priority handling, and logical channel prioritization.

The transmit (TX) processor 316 and the receive (RX) processor 370implement layer 1 functionality associated with various signalprocessing functions. Layer 1, which includes a physical (PHY) layer,may include error detection on the transport channels, forward errorcorrection (FEC) coding/decoding of the transport channels,interleaving, rate matching, mapping onto physical channels,modulation/demodulation of physical channels, and MIMO antennaprocessing. The TX processor 316 handles mapping to signalconstellations based on various modulation schemes (e.g., binaryphase-shift keying (BPSK), quadrature phase-shift keying (QPSK),M-phase-shift keying (M-PSK), M-quadrature amplitude modulation(M-QAM)). The coded and modulated symbols may then be split intoparallel streams. Each stream may then be mapped to an OFDM subcarrier,multiplexed with a reference signal (e.g., pilot) in the time and/orfrequency domain, and then combined together using an Inverse FastFourier Transform (IFFT) to produce a physical channel carrying a timedomain OFDM symbol stream. The OFDM stream is spatially precoded toproduce multiple spatial streams. Channel estimates from a channelestimator 374 may be used to determine the coding and modulation scheme,as well as for spatial processing. The channel estimate may be derivedfrom a reference signal and/or channel condition feedback transmitted bythe UE 350. Each spatial stream may then be provided to a differentantenna 320 via a separate transmitter 318 TX. Each transmitter 318 TXmay modulate a radio frequency (RF) carrier with a respective spatialstream for transmission.

At the UE 350, each receiver 354 RX receives a signal through itsrespective antenna 352. Each receiver 354 RX recovers informationmodulated onto an RF carrier and provides the information to the receive(RX) processor 356. The TX processor 368 and the RX processor 356implement layer 1 functionality associated with various signalprocessing functions. The RX processor 356 may perform spatialprocessing on the information to recover any spatial streams destinedfor the UE 350. If multiple spatial streams are destined for the UE 350,they may be combined by the RX processor 356 into a single OFDM symbolstream. The RX processor 356 then converts the OFDM symbol stream fromthe time-domain to the frequency domain using a Fast Fourier Transform(FFT). The frequency domain signal comprises a separate OFDM symbolstream for each subcarrier of the OFDM signal. The symbols on eachsubcarrier, and the reference signal, are recovered and demodulated bydetermining the most likely signal constellation points transmitted bythe base station 310. These soft decisions may be based on channelestimates computed by the channel estimator 358. The soft decisions arethen decoded and deinterleaved to recover the data and control signalsthat were originally transmitted by the base station 310 on the physicalchannel. The data and control signals are then provided to thecontroller/processor 359, which implements layer 3 and layer 2functionality.

The controller/processor 359 can be associated with a memory 360 thatstores program codes and data. The memory 360 may be referred to as acomputer-readable medium. In the UL, the controller/processor 359provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, and control signalprocessing to recover IP packets from the EPC 160. Thecontroller/processor 359 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with the DLtransmission by the base station 310, the controller/processor 359provides RRC layer functionality associated with system information(e.g., MIB, SIBs) acquisition, RRC connections, and measurementreporting; PDCP layer functionality associated with headercompression/decompression, and security (ciphering, deciphering,integrity protection, integrity verification); RLC layer functionalityassociated with the transfer of upper layer PDUs, error correctionthrough ARQ, concatenation, segmentation, and reassembly of RLC SDUs,re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; andMAC layer functionality associated with mapping between logical channelsand transport channels, multiplexing of MAC SDUs onto TBs,demultiplexing of MAC SDUs from TBs, scheduling information reporting,error correction through HARQ, priority handling, and logical channelprioritization.

Channel estimates derived by a channel estimator 358 from a referencesignal or feedback transmitted by the base station 310 may be used bythe TX processor 368 to select the appropriate coding and modulationschemes, and to facilitate spatial processing. The spatial streamsgenerated by the TX processor 368 may be provided to different antenna352 via separate transmitters 354TX. Each transmitter 354TX may modulatean RF carrier with a respective spatial stream for transmission.

The UL transmission is processed at the base station 310 in a mannersimilar to that described in connection with the receiver function atthe UE 350. Each receiver 318RX receives a signal through its respectiveantenna 320. Each receiver 318RX recovers information modulated onto anRF carrier and provides the information to a RX processor 370.

The controller/processor 375 can be associated with a memory 376 thatstores program codes and data. The memory 376 may be referred to as acomputer-readable medium. In the UL, the controller/processor 375provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, control signal processingto recover IP packets from the UE 350. IP packets from thecontroller/processor 375 may be provided to the EPC 160. Thecontroller/processor 375 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

At least one of the TX processor 368, the RX processor 356, and thecontroller/processor 359 may be configured to perform aspects inconnection with 198 of FIG. 1 .

At least one of the TX processor 316, the RX processor 370, and thecontroller/processor 375 may be configured to perform aspects inconnection with 199 of FIG. 1 .

FIG. 4 is a diagram 400 illustrating a HARQ-ACK message corresponding toa transmission via a PDSCH. A UE may transmit, to a base station, aHARQ-ACK message via a PUCCH to indicate whether a transmission (e.g., atransmission of a TB) via a PDSCH has been successfully decoded. Theparameter K1 may correspond to a time gap between the slot of the PDSCHtransmission and the slot in which the PUCCH that carries the HARQ-ACKmessage for the PDSCH transmission is received by the base station. TheHARQ-ACK message may be a 1-bit (i.e., a “1” or a “0) message. Forexample, if the UE has successfully decoded the PDSCH transmission, thecorresponding HARQ-ACK message may include an ACK (e.g., a “1”). On theother hand, if the UE has failed to decode the PDSCH transmission, thecorresponding HARQ-ACK message may include a NACK (e.g., a “0”). Uponreceiving a NACK, the base station may schedule a retransmission for thePDSCH transmission that the UE has failed to decode. A HARQ-ACK messagemay also be referred to as an ACK/NACK message.

A multi-bit HARQ-ACK (feedback) message may be referred to as a turboHARQ-ACK message. A UE may provide more information to the base stationvia a turbo HARQ-ACK message than via a 1-bit HARQ-ACK message. Forexample, the UE may indicate, via a turbo HARQ-ACK message to the basestation, a requested delta modulation and coding scheme (MCS) for asubsequent downlink transmission, where the requested delta MCS may bewith respect to the MCS used for the downlink transmission correspondingto the turbo HARQ-ACK message. In particular, the requested delta MCSmay be the difference between the MCS index of the requested target MCSfor a subsequent downlink transmission and the MCS index of the receivedPDSCH transmission corresponding to the turbo HARQ-ACK message, wherethe requested target MCS for the subsequent downlink transmission may bethe highest MCS such that the estimated block error rate (BLER) for a TBreceived via a subsequent PDSCH with this MCS would be less than orequal to a BLER target.

For example, a turbo HARQ-ACK message may include 2 bits, where a firstbit may indicate an ACK or a NACK, and the second bit may indicate anMCS change request or an unchanged MCS. When an MCS change request isindicated with an ACK, the requested delta MCS may be positive (e.g.,“+X”), and may correspond to an MCS increase for the subsequent downlinktransmission. On the other hand, when an MCS change request is indicatedwith a NACK, the requested delta MCS may be negative (e.g., “−Y”), andmay correspond to an MCS decrease for the subsequent downlinktransmission. The values of “X” and/or “Y” may be configured by the basestation (e.g., via an RRC message), or may be selected by the UE andthen indicated to the base station. Further, the codebook of the turboHARQ-ACK message (i.e., how the turbo HARQ-ACK message is to beinterpreted) may be configured by the base station, or may be selectedby the UE and then indicated to the base station.

A turbo HARQ-ACK message may enable a UE to provides the information tothe network to adjust the MCS for a subsequent downlink transmission forhigher transmission efficiency. For example, when the UE is able todecode the PDSCH transmission with a small number of iterations, the UEmay identify that the channel condition is sufficiently favorable toallow for a higher MCS without missing the BLER target. Accordingly, theUE may indicate, to the base station via a turbo HARQ-ACK message, anMCS increase request. The MCS increase request may be in the form of apositive requested delta MCS. In other words, for a BLER target, the UEmay indicate a desired MCS to the base station via the turbo HARQ-ACKmessage. The base station may increase the MCS for the subsequentdownlink transmission based on the positive requested delta MCSindicated via the turbo HARQ-ACK message. On the other hand, if thechannel condition is poor and the present BLER does not meet the BLERtarget, the UE may indicate, to the base station via a turbo HARQ-ACKmessage, an MCS decrease request in the form of a negative requesteddelta MCS. The base station may decrease the MCS for the subsequentdownlink transmission based on the negative requested delta MCSindicated via the turbo HARQ-ACK message. Of course, alternatively, thebase station may also disregard the requested delta MCS indicated viathe turbo HARQ-ACK message for various reasons.

In addition to being dependent on the MCS, the BLER may also depend onthe duplexing mode of the transmission. For example, for a given MCS, abetter BLER may be achieved in a half-duplex slot than in a full-duplexslot. This may be because the UE may suffer from self-interference whentransmitting and receiving in the full-duplex mode, whereas there maynot be any self-interference when the UE operates in the half-duplexmode.

In one or more aspects, a UE may transmit, to a base station, a turboHARQ-ACK message, where the turbo HARQ-ACK message may include anindication of a requested duplexing mode for a subsequent downlinktransmission. In one or more aspects, the turbo HARQ-ACK message mayalso include an indication of a requested delta MCS for the subsequentdownlink transmission. The indication of the requested duplexing modeand the indication of the requested delta MCS may be jointly encoded ina 2-bit turbo HARQ-ACK message, or in a turbo HARQ-ACK message that is 3bits or more in size.

FIG. 5 is a diagram of a communication flow 500 of a method of wirelesscommunication. At 506, the base station 504 may transmit, to the UE 502,and the UE 502 may receive, from the base station 504, a configurationfor a turbo HARQ-ACK message. In one configuration, the configurationfor the turbo HARQ-ACK message may be transmitted and received via anRRC message. Hereinafter a turbo HARQ-ACK message that does not includean indication of the requested duplexing mode for a subsequent downlinktransmission may be referred to as a half-duplex turbo HARQ-ACK message,and a turbo HARQ-ACK message that includes an indication of therequested duplexing mode for a subsequent transmission may be referredto as a full-duplex turbo HARQ-ACK message. Based on the configurationfor the turbo HARQ-ACK message, the UE may respond, for a transmission(e.g., a transmission of a TB) via a PDSCH, with either a full-duplexturbo HARQ-ACK message or a half-duplex turbo HARQ-ACK message. In otheraspects, the UE may respond with a simple HARQ-ACK message including the1-bit ACK/NACK indication. In one configuration, the configuration forthe turbo HARQ-ACK message may include indications of values of “X”and/or “Y” for the requested delta MCS. In one configuration, theconfiguration for the turbo HARQ-ACK message may include the codebook ofthe turbo HARQ-ACK message (i.e., how the turbo HARQ-ACK message is tobe interpreted).

At 508, the base station 504 may transmit, to the UE 502, and the UE 502may receive, from the base station 504, a first downlink transmission.The first downlink transmission may be a transmission of a first TB viaa first PDSCH. At 510, the UE 502 may transmit, to the base station 504,and the base station 504 may receive, from the UE 502, a turbo HARQ-ACKmessage corresponding to the first downlink transmission 508. The turboHARQ-ACK message may include an indication of a duplexing modeassociated with a second downlink transmission. The second downlinktransmission may be a subsequent transmission of a second TB via asecond PDSCH.

In one configuration, the turbo HARQ-ACK message 510 may include 2 bits,where a first bit may indicate an ACK or a NACK for the first downlinktransmission 508, and a second bit may indicate a requested duplexingmode for the second downlink transmission. The second bit may indicateeither that the full-duplex mode is requested for the second downlinktransmission, or that the half-duplex mode is requested for the seconddownlink transmission. The UE may select the requested duplexing modefor the second downlink transmission such that the BLER target may bemet.

In one configuration, the turbo HARQ-ACK message 510 may include 3 bits,where a first bit may indicate an ACK or a NACK for the first downlinktransmission 508, a second bit may indicate either an MCS change requestor an unchanged MCS for the second downlink transmission, and a thirdbit may indicate a requested duplexing mode for the second downlinktransmission. When the second bit indicates an MCS change request forthe second downlink transmission and the first bit indicates an ACK forthe first downlink transmission 508, the requested delta MCS maycorrespond to an MCS increase (e.g., “+X”) for the second downlinktransmission. On the other hand, when the second bit indicates an MCSchange request for the second downlink transmission and the first bitindicates a NACK for the first downlink transmission 508, the requesteddelta MCS may correspond to an MCS decrease (e.g., “−Y”) for the seconddownlink transmission. The values of “X” and/or “Y” may be configured bythe base station 504 (e.g., via an RRC message at 506), or may beselected by the UE 502 and then indicated to the base station 504. Thethird bit may indicate either that the full-duplex mode is requested forthe second downlink transmission, or that the half-duplex mode isrequested for the second downlink transmission. The UE may select therequested duplexing mode for the second downlink transmission such thatthe BLER target may be met.

In one configuration, the indication of the requested duplexing mode andthe indication of the requested delta MCS may be jointly encoded in a2-bit turbo HARQ-ACK message 510, where a first bit of the turboHARQ-ACK message 510 may indicate an ACK or a NACK for the firstdownlink transmission 508, and a second bit of the turbo HARQ-ACKmessage 510 may indicate a requested duplexing mode for the seconddownlink transmission. The second bit may indicate either that thefull-duplex mode is requested for the second downlink transmission, orthat the half-duplex mode is requested for the second downlinktransmission. The requested delta MCS for the second downlinktransmission may correspond to an MCS increase (e.g., “+X”) when thefirst bit indicates an ACK for the first downlink transmission 508 andthe second bit indicates that a full-duplex mode is requested for thesecond downlink transmission. The requested delta MCS for the seconddownlink transmission may correspond to an unchanged MCS when the firstbit indicates an ACK for the first downlink transmission 508 and thesecond bit indicates that a half-duplex mode is requested for the seconddownlink transmission, or when the first bit indicates a NACK for thefirst downlink transmission 508 and the second bit indicates that afull-duplex mode is requested for the second downlink transmission. Therequested delta MCS for the second downlink transmission may correspondto an MCS decrease (e.g., “−Y”) when the first bit indicates a NACK forthe first downlink transmission 508 and the second bit indicates that ahalf-duplex mode is requested for the second downlink transmission.

Although several example codebooks for the full-duplex turbo HARQ-ACKmessage or methods for encoding the different indications in thefull-duplex turbo HARQ-ACK message (i.e., how the turbo HARQ-ACK messageis to be interpreted) have been described, these example codebooks donot limit the disclosure. The actual codebook used for the full-duplexturbo HARQ-ACK message may be configured by the base station 504, or maybe selected by the UE 502 and then indicated to the base station 504.

At 512, the base station 504 may transmit, to the UE 502, and the UE 502may receive, from the base station 504, the second downlink transmissionbased on the indication of the duplexing mode. In one configuration,when transmitting the second downlink transmission, the base station 504may follow the requested duplexing mode as indicated in the turboHARQ-ACK message 510. In another configuration, when transmitting thesecond downlink transmission, the base station 504 may not follow andmay disregard the requested duplexing mode as indicated in the turboHARQ-ACK message 510. As described above, the second downlinktransmission may be a transmission of the second TB via the secondPDSCH. The second TB may include a retransmission of the first TB (e.g.,when the UE 502 has indicated a NACK for the first downlink transmission508 via the turbo HARQ-ACK message 510) or a new TB.

In one or more aspects, the UE 502 may be configured with both thehalf-duplex turbo HARQ-ACK feedback and the full-duplex turbo HARQ-ACKfeedback. In one configuration, if the UE 502 receives the firstdownlink transmission 508 in a half-duplex slot, the UE 502 may transit,to the base station 504, a half-duplex turbo HARQ-ACK message (i.e., aturbo HARQ-ACK message not including an indication of a requestedduplexing mode) (not shown) corresponding to the first downlinktransmission 508. On the other hand, if the UE 502 receives the firstdownlink transmission 508 in a full-duplex slot, the UE 502 may transit,to the base station 504, a full-duplex turbo HARQ-ACK message 510 (i.e.,a turbo HARQ-ACK message including an indication of a requestedduplexing mode) corresponding to the first downlink transmission 508.

In one configuration, in providing the HARQ-ACK feedback correspondingto the first downlink transmission 508, the UE 502 may choose whether totransmit a half-duplex turbo HARQ-ACK message (not shown) or afull-duplex turbo HARQ-ACK message 510 to the base station 504. In oneconfiguration, the UE may include in the turbo HARQ-ACK message anadditional indication (e.g., via an additional bit) of whether the turboHARQ-ACK message is a half-duplex turbo HARQ-ACK message (not shown) ora full-duplex turbo HARQ-ACK message 510.

FIG. 6 is a flowchart 600 of a method of wireless communication. Themethod may be performed by a UE (e.g., the UE 104/350/502; the apparatus1002). At 602, the UE may transmit, to a base station, a turbo HARQ-ACKmessage corresponding to a first downlink transmission. The turboHARQ-ACK message may include an indication of a duplexing modeassociated with a second downlink transmission. For example, 602 may beperformed by the turbo HARQ-ACK component 1040 in FIG. 10 . Referring toFIG. 5 , at 510, the UE 502 may transmit, to a base station 504, a turboHARQ-ACK message corresponding to a first downlink transmission 508.

At 604, the UE may receive, from the base station, the second downlinktransmission based on the indication of the duplexing mode. For example,604 may be performed by the turbo HARQ-ACK component 1040 in FIG. 10 .Referring to FIG. 5 , at 512, the UE 502 may receive, from the basestation 504, the second downlink transmission based on the indication ofthe duplexing mode.

FIG. 7 is a flowchart 700 of a method of wireless communication. Themethod may be performed by a UE (e.g., the UE 104/350/502; the apparatus1002). At 704, the UE may transmit, to a base station, a turbo HARQ-ACKmessage corresponding to a first downlink transmission. The turboHARQ-ACK message may include an indication of a duplexing modeassociated with a second downlink transmission. For example, 704 may beperformed by the turbo HARQ-ACK component 1040 in FIG. 10 . Referring toFIG. 5 , at 510, the UE 502 may transmit, to a base station 504, a turboHARQ-ACK message corresponding to a first downlink transmission 508.

At 706, the UE may receive, from the base station, the second downlinktransmission based on the indication of the duplexing mode. For example,706 may be performed by the turbo HARQ-ACK component 1040 in FIG. 10 .Referring to FIG. 5 , at 512, the UE 502 may receive, from the basestation 504, the second downlink transmission based on the indication ofthe duplexing mode.

In one configuration, referring back to FIG. 5 , the first downlinktransmission 508 may correspond to a first TB. The second downlinktransmission 512 may correspond to a second TB.

In one configuration, the second TB may include a retransmission of thefirst TB or a new TB.

In one configuration, the indication of the duplexing mode maycorrespond to a full-duplex mode or a half-duplex mode.

In one configuration, referring back to FIG. 5 , the turbo HARQ-ACKmessage 510 may further include an ACK/NACK indication corresponding tothe first downlink transmission 508.

In one configuration, referring back to FIG. 5 , the turbo HARQ-ACKmessage 510 may include at least 3 bits including one or more first bitsfor the ACK/NACK indication, one or more second bits for an indicationof a requested delta MCS for the second downlink transmission 512 withrespect to an MCS associated with the first downlink transmission 508,and one or more third bits for the indication of the duplexing mode.

In one configuration, referring back to FIG. 5 , the turbo HARQ-ACKmessage 510 may be a 2-bit message including a first bit for theACK/NACK indication and a second bit for the indication of the duplexingmode.

In one configuration, referring back to FIG. 5 , the 2-bit turboHARQ-ACK message may further indicate a requested delta MCS for thesecond downlink transmission 512 with respect to an MCS associated withthe first downlink transmission 508.

In one configuration, the requested delta MCS may correspond to at leastone of an MCS increase, an unchanged MCS, or an MCS decrease.

In one configuration, the requested delta MCS for the second downlinktransmission may correspond to a) an MCS increase when the ACK/NACKindication corresponds to an ACK and the indication of the duplexingmode corresponds to a full-duplex mode, b) an unchanged MCS when theACK/NACK indication corresponds to the ACK and the indication of theduplexing mode corresponds to a half-duplex mode, or when the ACK/NACKindication corresponds to a NACK and the indication of the duplexingmode corresponds to the full-duplex mode, or c) an MCS decrease when theACK/NACK indication corresponds to the NACK and the indication of theduplexing mode corresponds to the half-duplex mode.

In one configuration, referring back to FIG. 5 , the first downlinktransmission 508 may be associated with a full-duplex transmission.

In one configuration, referring back to FIG. 5 , the turbo HARQ-ACKmessage 510 may further include an indication that the turbo HARQ-ACKmessage 510 includes the indication of the duplexing mode associatedwith the second downlink transmission 512.

In one configuration, at 702, the UE may receive, from the base station,a configuration for the turbo HARQ-ACK message. For example, 702 may beperformed by the turbo HARQ-ACK component 1040 in FIG. 10 . Referring toFIG. 5 , at 506, the UE 502 may receive, from the base station 504, aconfiguration for the turbo HARQ-ACK message 510.

FIG. 8 is a flowchart 800 of a method of wireless communication. Themethod may be performed by a base station (e.g., the base station102/180/310/504; the apparatus 1102). At 802, the base station mayreceive, from a UE, a turbo HARQ-ACK message corresponding to a firstdownlink transmission. The turbo HARQ-ACK message may include anindication of a duplexing mode associated with a second downlinktransmission. For example, 802 may be performed by the turbo HARQ-ACKcomponent 1140 in FIG. 11 . Referring to FIG. 5 , at 510, the basestation 504 may receive, from a UE 502, a turbo HARQ-ACK messagecorresponding to a first downlink transmission 508.

At 804, the base station may transmit, to the UE, the second downlinktransmission based on the indication of the duplexing mode. For example,804 may be performed by the turbo HARQ-ACK component 1140 in FIG. 11 .Referring to FIG. 5 , at 512, the base station 504 may transmit, to theUE 502, the second downlink transmission based on the indication of theduplexing mode.

FIG. 9 is a flowchart 900 of a method of wireless communication. Themethod may be performed by a base station (e.g., the base station102/180/310/504; the apparatus 1102). At 904, the base station mayreceive, from a UE, a turbo HARQ-ACK message corresponding to a firstdownlink transmission. The turbo HARQ-ACK message may include anindication of a duplexing mode associated with a second downlinktransmission. For example, 904 may be performed by the turbo HARQ-ACKcomponent 1140 in FIG. 11 . Referring to FIG. 5 , at 510, the basestation 504 may receive, from a UE 502, a turbo HARQ-ACK messagecorresponding to a first downlink transmission 508.

At 906, the base station may transmit, to the UE, the second downlinktransmission based on the indication of the duplexing mode. For example,906 may be performed by the turbo HARQ-ACK component 1140 in FIG. 11 .Referring to FIG. 5 , at 512, the base station 504 may transmit, to theUE 502, the second downlink transmission based on the indication of theduplexing mode.

In one configuration, referring back to FIG. 5 , the first downlinktransmission 508 may correspond to a first TB. The second downlinktransmission 512 may correspond to a second TB.

In one configuration, the second TB may include a retransmission of thefirst TB or a new TB.

In one configuration, the indication of the duplexing mode maycorrespond to a full-duplex mode or a half-duplex mode.

In one configuration, referring back to FIG. 5 , the turbo HARQ-ACKmessage 510 may further include an ACK/NACK indication corresponding tothe first downlink transmission 508.

In one configuration, referring back to FIG. 5 , the turbo HARQ-ACKmessage may include at least 3 bits including one or more first bits forthe ACK/NACK indication, one or more second bits for an indication of arequested delta MCS for the second downlink transmission 512 withrespect to an MCS associated with the first downlink transmission 508,and one or more third bits for the indication of the duplexing mode.

In one configuration, the turbo HARQ-ACK message may be a 2-bit messageincluding a first bit for the ACK/NACK indication and a second bit forthe indication of the duplexing mode.

In one configuration, referring back to FIG. 5 , the 2-bit turboHARQ-ACK message may further indicate a requested delta MCS for thesecond downlink transmission 512 with respect to an MCS associated withthe first downlink transmission 508.

In one configuration, the requested delta MCS may correspond to at leastone of an MCS increase, an unchanged MCS, or an MCS decrease.

In one configuration, the requested delta MCS for the second downlinktransmission may correspond to a) an MCS increase when the ACK/NACKindication corresponds to an ACK and the indication of the duplexingmode corresponds to a full-duplex mode, b) an unchanged MCS when theACK/NACK indication corresponds to the ACK and the indication of theduplexing mode corresponds to a half-duplex mode, or when the ACK/NACKindication corresponds to a NACK and the indication of the duplexingmode corresponds to the full-duplex mode, or c) an MCS decrease when theACK/NACK indication corresponds to the NACK and the indication of theduplexing mode corresponds to the half-duplex mode.

In one configuration, referring back to FIG. 5 , the first downlinktransmission 508 may be associated with a full-duplex transmission.

In one configuration, referring back to FIG. 5 , the turbo HARQ-ACKmessage 510 may further include an indication that the turbo HARQ-ACKmessage 510 includes the indication of the duplexing mode associatedwith the second downlink transmission 512.

In one configuration, at 902, the base station may transmit, to the UE,a configuration for the turbo HARQ-ACK message. For example, 902 may beperformed by the turbo HARQ-ACK component 1140 in FIG. 11 . Referring toFIG. 5 , at 506, the base station 504 may transmit, to the UE 502, aconfiguration for the turbo HARQ-ACK message 510.

FIG. 10 is a diagram 1000 illustrating an example of a hardwareimplementation for an apparatus 1002. The apparatus 1002 may be a UE, acomponent of a UE, or may implement UE functionality. In some aspects,the apparatus 1002 may include a cellular baseband processor 1004 (alsoreferred to as a modem) coupled to a cellular RF transceiver 1022. Insome aspects, the apparatus 1002 may further include one or moresubscriber identity modules (SIM) cards 1020, an application processor1006 coupled to a secure digital (SD) card 1008 and a screen 1010, aBluetooth module 1012, a wireless local area network (WLAN) module 1014,a Global Positioning System (GPS) module 1016, or a power supply 1018.The cellular baseband processor 1004 communicates through the cellularRF transceiver 1022 with the UE 104 and/or BS 102/180. The cellularbaseband processor 1004 may include a computer-readable medium/memory.The computer-readable medium/memory may be non-transitory. The cellularbaseband processor 1004 is responsible for general processing, includingthe execution of software stored on the computer-readable medium/memory.The software, when executed by the cellular baseband processor 1004,causes the cellular baseband processor 1004 to perform the variousfunctions described supra. The computer-readable medium/memory may alsobe used for storing data that is manipulated by the cellular basebandprocessor 1004 when executing software. The cellular baseband processor1004 further includes a reception component 1030, a communicationmanager 1032, and a transmission component 1034. The communicationmanager 1032 includes the one or more illustrated components. Thecomponents within the communication manager 1032 may be stored in thecomputer-readable medium/memory and/or configured as hardware within thecellular baseband processor 1004. The cellular baseband processor 1004may be a component of the UE 350 and may include the memory 360 and/orat least one of the TX processor 368, the RX processor 356, and thecontroller/processor 359. In one configuration, the apparatus 1002 maybe a modem chip and include just the baseband processor 1004, and inanother configuration, the apparatus 1002 may be the entire UE (e.g.,see 350 of FIG. 3 ) and include the additional modules of the apparatus1002.

The communication manager 1032 includes a turbo HARQ-ACK component 1040that may be configured to receive, from the base station, aconfiguration for the turbo HARQ-ACK message, e.g., as described inconnection with 702 in FIG. 7 . The turbo HARQ-ACK component 1040 may befurther configured to transmit, to a base station, a turbo HARQ-ACKmessage corresponding to a first downlink transmission, e.g., asdescribed in connection with 602 in FIGS. 6 and 704 in FIG. 7 . Theturbo HARQ-ACK component 1040 may be further configured to receive, fromthe base station, the second downlink transmission based on theindication of the duplexing mode, e.g., as described in connection with604 in FIGS. 6 and 706 in FIG. 7 .

The apparatus may include additional components that perform each of theblocks of the algorithm in the flowcharts of FIGS. 5-7 . As such, eachblock in the flowcharts of FIGS. 5-7 may be performed by a component andthe apparatus may include one or more of those components. Thecomponents may be one or more hardware components specificallyconfigured to carry out the stated processes/algorithm, implemented by aprocessor configured to perform the stated processes/algorithm, storedwithin a computer-readable medium for implementation by a processor, orsome combination thereof.

As shown, the apparatus 1002 may include a variety of componentsconfigured for various functions. In one configuration, the apparatus1002, and in particular the cellular baseband processor 1004, mayinclude means for transmitting, to a base station, a turbo HARQ-ACKmessage corresponding to a first downlink transmission. The turboHARQ-ACK message may include an indication of a duplexing modeassociated with a second downlink transmission. The apparatus 1002, andin particular the cellular baseband processor 1004, may further includemeans for receiving, from the base station, the second downlinktransmission based on the indication of the duplexing mode.

In one configuration, the first downlink transmission may correspond toa first TB. The second downlink transmission may correspond to a secondTB. In one configuration, the second TB may include a retransmission ofthe first TB or a new TB. In one configuration, the indication of theduplexing mode may correspond to a full-duplex mode or a half-duplexmode. In one configuration, the turbo HARQ-ACK message may furtherinclude an ACK/NACK indication corresponding to the first downlinktransmission. In one configuration, the turbo HARQ-ACK message mayinclude at least 3 bits including one or more first bits for theACK/NACK indication, one or more second bits for an indication of arequested delta MCS for the second downlink transmission with respect toan MCS associated with the first downlink transmission, and one or morethird bits for the indication of the duplexing mode. In oneconfiguration, the turbo HARQ-ACK message may be a 2-bit messageincluding a first bit for the ACK/NACK indication and a second bit forthe indication of the duplexing mode. In one configuration, the 2-bitturbo HARQ-ACK message may further indicate a requested delta MCS forthe second downlink transmission with respect to an MCS associated withthe first downlink transmission. In one configuration, the requesteddelta MCS may correspond to at least one of an MCS increase, anunchanged MCS, or an MCS decrease. In one configuration, the requesteddelta MCS for the second downlink transmission may correspond to a) anMCS increase when the ACK/NACK indication corresponds to an ACK and theindication of the duplexing mode corresponds to a full-duplex mode, b)an unchanged MCS when the ACK/NACK indication corresponds to the ACK andthe indication of the duplexing mode corresponds to a half-duplex mode,or when the ACK/NACK indication corresponds to a NACK and the indicationof the duplexing mode corresponds to the full-duplex mode, or c) an MCSdecrease when the ACK/NACK indication corresponds to the NACK and theindication of the duplexing mode corresponds to the half-duplex mode. Inone configuration, the first downlink transmission may be associatedwith a full-duplex transmission. In one configuration, the turboHARQ-ACK message may further include an indication that the turboHARQ-ACK message includes the indication of the duplexing modeassociated with the second downlink transmission. In one configuration,the apparatus 1002, and in particular the cellular baseband processor1004, may further include means for receiving, from the base station, aconfiguration for the turbo HARQ-ACK message.

The means may be one or more of the components of the apparatus 1002configured to perform the functions recited by the means. As describedsupra, the apparatus 1002 may include the TX Processor 368, the RXProcessor 356, and the controller/processor 359. As such, in oneconfiguration, the means may be the TX Processor 368, the RX Processor356, and the controller/processor 359 configured to perform thefunctions recited by the means.

FIG. 11 is a diagram 1100 illustrating an example of a hardwareimplementation for an apparatus 1102. The apparatus 1102 may be a basestation, a component of a base station, or may implement base stationfunctionality. In some aspects, the apparatus 1102 may include abaseband unit 1104. The baseband unit 1104 may communicate through acellular RF transceiver 1122 with the UE 104. The baseband unit 1104 mayinclude a computer-readable medium/memory. The baseband unit 1104 isresponsible for general processing, including the execution of softwarestored on the computer-readable medium/memory. The software, whenexecuted by the baseband unit 1104, causes the baseband unit 1104 toperform the various functions described supra. The computer-readablemedium/memory may also be used for storing data that is manipulated bythe baseband unit 1104 when executing software. The baseband unit 1104further includes a reception component 1130, a communication manager1132, and a transmission component 1134. The communication manager 1132includes the one or more illustrated components. The components withinthe communication manager 1132 may be stored in the computer-readablemedium/memory and/or configured as hardware within the baseband unit1104. The baseband unit 1104 may be a component of the base station 310and may include the memory 376 and/or at least one of the TX processor316, the RX processor 370, and the controller/processor 375.

The communication manager 1132 includes a turbo HARQ-ACK component 1140that may be configured to transmit, to the UE, a configuration for theturbo HARQ-ACK message, e.g., as described in connection with 902 inFIG. 9 . The turbo HARQ-ACK component 1140 may be configured to receive,from a UE, a turbo HARQ-ACK message corresponding to a first downlinktransmission, e.g., as described in connection with 802 in FIGS. 8 and904 in FIG. 9 . The turbo HARQ-ACK component 1140 may be configured totransmit, to the UE, the second downlink transmission based on theindication of the duplexing mode, e.g., as described in connection with804 in FIGS. 8 and 906 in FIG. 9 .

The apparatus may include additional components that perform each of theblocks of the algorithm in the flowcharts of FIGS. 5, 8, and 9 . Assuch, each block in the flowcharts of FIGS. 5, 8, and 9 may be performedby a component and the apparatus may include one or more of thosecomponents. The components may be one or more hardware componentsspecifically configured to carry out the stated processes/algorithm,implemented by a processor configured to perform the statedprocesses/algorithm, stored within a computer-readable medium forimplementation by a processor, or some combination thereof.

As shown, the apparatus 1102 may include a variety of componentsconfigured for various functions. In one configuration, the apparatus1102, and in particular the baseband unit 1104, may include means forreceiving, from a UE, a turbo HARQ-ACK message corresponding to a firstdownlink transmission. The turbo HARQ-ACK message may include anindication of a duplexing mode associated with a second downlinktransmission. The apparatus 1102, and in particular the baseband unit1104, may further include means for transmitting, to the UE, the seconddownlink transmission based on the indication of the duplexing mode.

In one configuration, the first downlink transmission may correspond toa first TB. The second downlink transmission may correspond to a secondTB. In one configuration, the second TB may include a retransmission ofthe first TB or a new TB. In one configuration, the indication of theduplexing mode may correspond to a full-duplex mode or a half-duplexmode. In one configuration, the turbo HARQ-ACK message may furtherinclude an ACK/NACK indication corresponding to the first downlinktransmission. In one configuration, the turbo HARQ-ACK message mayinclude at least 3 bits including one or more first bits for theACK/NACK indication, one or more second bits for an indication of arequested delta MCS for the second downlink transmission with respect toan MCS associated with the first downlink transmission, and one or morethird bits for the indication of the duplexing mode. In oneconfiguration, the turbo HARQ-ACK message may be a 2-bit messageincluding a first bit for the ACK/NACK indication and a second bit forthe indication of the duplexing mode. In one configuration, the 2-bitturbo HARQ-ACK message may further indicate a requested delta MCS forthe second downlink transmission with respect to an MCS associated withthe first downlink transmission. In one configuration, the requesteddelta MCS may correspond to at least one of an MCS increase, anunchanged MCS, or an MCS decrease. In one configuration, the requesteddelta MCS for the second downlink transmission may correspond to a) anMCS increase when the ACK/NACK indication corresponds to an ACK and theindication of the duplexing mode corresponds to a full-duplex mode, b)an unchanged MCS when the ACK/NACK indication corresponds to the ACK andthe indication of the duplexing mode corresponds to a half-duplex mode,or when the ACK/NACK indication corresponds to a NACK and the indicationof the duplexing mode corresponds to the full-duplex mode, or c) an MCSdecrease when the ACK/NACK indication corresponds to the NACK and theindication of the duplexing mode corresponds to the half-duplex mode. Inone configuration, the first downlink transmission may be associatedwith a full-duplex transmission. In one configuration, the turboHARQ-ACK message may further include an indication that the turboHARQ-ACK message includes the indication of the duplexing modeassociated with the second downlink transmission. In one configuration,the apparatus 1102, and in particular the baseband unit 1104, mayfurther include means for transmitting, to the UE, a configuration forthe turbo HARQ-ACK message.

The means may be one or more of the components of the apparatus 1102configured to perform the functions recited by the means. As describedsupra, the apparatus 1102 may include the TX Processor 316, the RXProcessor 370, and the controller/processor 375. As such, in oneconfiguration, the means may be the TX Processor 316, the RX Processor370, and the controller/processor 375 configured to perform thefunctions recited by the means.

Referring back to FIGS. 4-9 , a UE may transmit, to a base station, andthe base station may receive, from the UE, a turbo HARQ-ACK messagecorresponding to a first downlink transmission. The turbo HARQ-ACKmessage may include an indication of a duplexing mode associated with asecond downlink transmission. The base station may transmit, to the UE,and the UE may receive, from the base station, the second downlinktransmission based on the indication of the duplexing mode. Accordingly,a duplexing mode for a subsequent downlink transmission may be indicatedvia a HARQ-ACK message associated with a previous downlink transmission.

It is understood that the specific order or hierarchy of blocks in theprocesses/flowcharts disclosed is an illustration of example approaches.Based upon design preferences, it is understood that the specific orderor hierarchy of blocks in the processes/flowcharts may be rearranged.Further, some blocks may be combined or omitted. The accompanying methodclaims present elements of the various blocks in a sample order, and arenot meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Terms such as “if,” “when,” and“while” should be interpreted to mean “under the condition that” ratherthan imply an immediate temporal relationship or reaction. That is,these phrases, e.g., “when,” do not imply an immediate action inresponse to or during the occurrence of an action, but simply imply thatif a condition is met then an action will occur, but without requiring aspecific or immediate time constraint for the action to occur. The word“exemplary” is used herein to mean “serving as an example, instance, orillustration.” Any aspect described herein as “exemplary” is notnecessarily to be construed as preferred or advantageous over otheraspects. Unless specifically stated otherwise, the term “some” refers toone or more. Combinations such as “at least one of A, B, or C,” “one ormore of A, B, or C,” “at least one of A, B, and C,” “one or more of A,B, and C,” and “A, B, C, or any combination thereof” include anycombination of A, B, and/or C, and may include multiples of A, multiplesof B, or multiples of C. Specifically, combinations such as “at leastone of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B,and C,” “one or more of A, B, and C,” and “A, B, C, or any combinationthereof” may be A only, B only, C only, A and B, A and C, B and C, or Aand B and C, where any such combinations may contain one or more memberor members of A, B, or C. All structural and functional equivalents tothe elements of the various aspects described throughout this disclosurethat are known or later come to be known to those of ordinary skill inthe art are expressly incorporated herein by reference and are intendedto be encompassed by the claims. Moreover, nothing disclosed herein isintended to be dedicated to the public regardless of whether suchdisclosure is explicitly recited in the claims. The words “module,”“mechanism,” “element,” “device,” and the like may not be a substitutefor the word “means.” As such, no claim element is to be construed as ameans plus function unless the element is expressly recited using thephrase “means for.”

The following aspects are illustrative only and may be combined withother aspects or teachings described herein, without limitation.

Aspect 1 is an apparatus for wireless communication at a UE including atleast one processor coupled to a memory and configured to transmit, to abase station, a turbo HARQ-ACK message corresponding to a first downlinktransmission, the turbo HARQ-ACK message including an indication of aduplexing mode associated with a second downlink transmission; andreceive, from the base station, the second downlink transmission basedon the indication of the duplexing mode.

Aspect 2 is the apparatus of aspect 1, where the first downlinktransmission corresponds to a first TB, and the second downlinktransmission corresponds to a second TB.

Aspect 3 is the apparatus of aspect 2, where the second TB includes aretransmission of the first TB or a new TB.

Aspect 4 is the apparatus of any of aspects 1 to 3, where the indicationof the duplexing mode corresponds to a full-duplex mode or a half-duplexmode.

Aspect 5 is the apparatus of any of aspects 1 to 4, where the turboHARQ-ACK message further includes an ACK/NACK indication correspondingto the first downlink transmission.

Aspect 6 is the apparatus of aspect 5, where the turbo HARQ-ACK messageincludes at least 3 bits including one or more first bits for theACK/NACK indication, one or more second bits for an indication of arequested delta MCS for the second downlink transmission with respect toan MCS associated with the first downlink transmission, and one or morethird bits for the indication of the duplexing mode.

Aspect 7 is the apparatus of aspect 5, where the turbo HARQ-ACK messageis a 2-bit message including a first bit for the ACK/NACK indication anda second bit for the indication of the duplexing mode.

Aspect 8 is the apparatus of aspect 7, where the 2-bit turbo HARQ-ACKmessage further indicates a requested delta MCS for the second downlinktransmission with respect to an MCS associated with the first downlinktransmission.

Aspect 9 is the apparatus of aspect 8, where the requested delta MCScorresponds to at least one of an MCS increase, an unchanged MCS, or anMCS decrease.

Aspect 10 is the apparatus of any of aspects 8 and 9, where therequested delta MCS for the second downlink transmission corresponds toa) an MCS increase when the ACK/NACK indication corresponds to an ACKand the indication of the duplexing mode corresponds to a full-duplexmode, b) an unchanged MCS when the ACK/NACK indication corresponds tothe ACK and the indication of the duplexing mode corresponds to ahalf-duplex mode, or when the ACK/NACK indication corresponds to a NACKand the indication of the duplexing mode corresponds to the full-duplexmode, or c) an MCS decrease when the ACK/NACK indication corresponds tothe NACK and the indication of the duplexing mode corresponds to thehalf-duplex mode.

Aspect 11 is the apparatus of any of aspects 1 to 10, where the firstdownlink transmission is associated with a full-duplex transmission.

Aspect 12 is the apparatus of any of aspects 1 to 11, where the turboHARQ-ACK message further includes an indication that the turbo HARQ-ACKmessage includes the indication of the duplexing mode associated withthe second downlink transmission.

Aspect 13 is the apparatus of any of aspects 1 to 12, the at least oneprocessor being further configured to: receive, from the base station, aconfiguration for the turbo HARQ-ACK message.

Aspect 14 is the apparatus of any of aspects 1 to 13, further includinga transceiver coupled to the at least one processor.

Aspect 15 is an apparatus for wireless communication at a base stationincluding at least one processor coupled to a memory and configured toreceive, from a UE, a turbo HARQ-ACK message corresponding to a firstdownlink transmission, the turbo HARQ-ACK message including anindication of a duplexing mode associated with a second downlinktransmission; and transmit, to the UE, the second downlink transmissionbased on the indication of the duplexing mode.

Aspect 16 is the apparatus of aspect 15, where the first downlinktransmission corresponds to a first TB, and the second downlinktransmission corresponds to a second TB.

Aspect 17 is the apparatus of aspect 16, where the second TB includes aretransmission of the first TB or a new TB.

Aspect 18 is the apparatus of any of aspects 15 to 17, where theindication of the duplexing mode corresponds to a full-duplex mode or ahalf-duplex mode.

Aspect 19 is the apparatus of any of aspects 15 to 18, where the turboHARQ-ACK message further includes an ACK/NACK indication correspondingto the first downlink transmission.

Aspect 20 is the apparatus of aspect 19, where the turbo HARQ-ACKmessage includes at least 3 bits including one or more first bits forthe ACK/NACK indication, one or more second bits for an indication of arequested delta MCS for the second downlink transmission with respect toan MCS associated with the first downlink transmission, and one or morethird bits for the indication of the duplexing mode.

Aspect 21 is the apparatus of aspect 19, where the turbo HARQ-ACKmessage is a 2-bit message including a first bit for the ACK/NACKindication and a second bit for the indication of the duplexing mode.

Aspect 22 is the apparatus of aspect 21, where the 2-bit turbo HARQ-ACKmessage further indicates a requested delta MCS for the second downlinktransmission with respect to an MCS associated with the first downlinktransmission.

Aspect 23 is the apparatus of aspect 22, where the requested delta MCScorresponds to at least one of an MCS increase, an unchanged MCS, or anMCS decrease.

Aspect 24 is the apparatus of any of aspects 22 and 23, where therequested delta MCS for the second downlink transmission corresponds toa) an MCS increase when the ACK/NACK indication corresponds to an ACKand the indication of the duplexing mode corresponds to a full-duplexmode, b) an unchanged MCS when the ACK/NACK indication corresponds tothe ACK and the indication of the duplexing mode corresponds to ahalf-duplex mode, or when the ACK/NACK indication corresponds to a NACKand the indication of the duplexing mode corresponds to the full-duplexmode, or c) an MCS decrease when the ACK/NACK indication corresponds tothe NACK and the indication of the duplexing mode corresponds to thehalf-duplex mode.

Aspect 25 is the apparatus of any of aspects 15 to 24, where the firstdownlink transmission is associated with a full-duplex transmission.

Aspect 26 is the apparatus of any of aspects 15 to 25, where the turboHARQ-ACK message further includes an indication that the turbo HARQ-ACKmessage includes the indication of the duplexing mode associated withthe second downlink transmission.

Aspect 27 is the apparatus of any of aspects 15 to 26, the at least oneprocessor being further configured to: transmit, to the UE, aconfiguration for the turbo HARQ-ACK message.

Aspect 28 is the apparatus of any of aspects 15 to 27, further includinga transceiver coupled to the at least one processor.

Aspect 29 is a method of wireless communication for implementing any ofaspects 1 to 28.

Aspect 30 is an apparatus for wireless communication including means forimplementing any of aspects 1 to 28.

Aspect 31 is a computer-readable medium storing computer executablecode, where the code when executed by a processor causes the processorto implement any of aspects 1 to 28.

What is claimed is:
 1. An apparatus for wireless communication at a userequipment (UE), comprising: memory; and at least one processor coupledto the memory and configured to: transmit, to a base station, a turbohybrid automatic repeat request (HARQ)— acknowledgement (ACK) (HARQ-ACK)message corresponding to a first downlink transmission, the turboHARQ-ACK message including an indication of a duplexing mode associatedwith a second downlink transmission, wherein the turbo HARQ-ACK messageindicates a requested delta modulation and coding scheme (MCS) for thesecond downlink transmission; and receive, from the base station, thesecond downlink transmission based on the indication of the duplexingmode.
 2. The apparatus of claim 1, wherein the first downlinktransmission corresponds to a first transport block (TB), and the seconddownlink transmission corresponds to a second TB.
 3. The apparatus ofclaim 2, wherein the second TB comprises a retransmission of the firstTB or a new TB.
 4. The apparatus of claim 1, wherein the indication ofthe duplexing mode corresponds to a full-duplex mode or a half-duplexmode.
 5. The apparatus of claim 1, wherein the turbo HARQ-ACK messagefurther includes an ACK/negative acknowledgement (NACK) (ACK/NACK)indication corresponding to the first downlink transmission.
 6. Theapparatus of claim 5, wherein the turbo HARQ-ACK message comprises atleast 3 bits including one or more first bits for the ACK/NACKindication, one or more second bits for an indication of the requesteddelta MCS for the second downlink transmission with respect to an MCSassociated with the first downlink transmission, and one or more thirdbits for the indication of the duplexing mode.
 7. The apparatus of claim5, wherein the turbo HARQ-ACK message is a 2-bit message including afirst bit for the ACK/NACK indication and a second bit for theindication of the duplexing mode.
 8. The apparatus of claim 7, whereinthe 2-bit turbo HARQ-ACK message further indicates the requested deltaMCS for the second downlink transmission with respect to an MCSassociated with the first downlink transmission.
 9. The apparatus ofclaim 8, wherein the requested delta MCS corresponds to at least one ofan MCS increase, an unchanged MCS, or an MCS decrease.
 10. The apparatusof claim 8, wherein the requested delta MCS for the second downlinktransmission corresponds to a) an MCS increase when the ACK/NACKindication corresponds to an ACK and the indication of the duplexingmode corresponds to a full-duplex mode, b) an unchanged MCS when theACK/NACK indication corresponds to the ACK and the indication of theduplexing mode corresponds to a half-duplex mode, or when the ACK/NACKindication corresponds to a NACK and the indication of the duplexingmode corresponds to the full-duplex mode, or c) an MCS decrease when theACK/NACK indication corresponds to the NACK and the indication of theduplexing mode corresponds to the half-duplex mode.
 11. The apparatus ofclaim 1, wherein the first downlink transmission is associated with afull-duplex transmission.
 12. The apparatus of claim 1, wherein theturbo HARQ-ACK message further includes an indication that the turboHARQ-ACK message includes the indication of the duplexing modeassociated with the second downlink transmission.
 13. The apparatus ofclaim 1, the at least one processor being further configured to:receive, from the base station, a configuration for the turbo HARQ-ACKmessage.
 14. The apparatus of claim 1, further comprising a transceivercoupled to the at least one processor.
 15. A method of wirelesscommunication at a user equipment (UE), comprising: transmitting, to abase station, a turbo hybrid automatic repeat request(HARQ)—acknowledgement (ACK) (HARQ-ACK) message corresponding to a firstdownlink transmission, the turbo HARQ-ACK message including anindication of a duplexing mode associated with a second downlinktransmission, wherein the turbo HARQ-ACK message indicates a requesteddelta modulation and coding scheme (MCS) for the second downlinktransmission; and receiving, from the base station, the second downlinktransmission based on the indication of the duplexing mode.
 16. Anapparatus for wireless communication at a base station, comprising:memory; and at least one processor coupled to the memory and configuredto: receive, from a user equipment (UE), a turbo hybrid automatic repeatrequest (HARQ)—acknowledgement (ACK) (HARQ-ACK) message corresponding toa first downlink transmission, the turbo HARQ-ACK message including anindication of a duplexing mode associated with a second downlinktransmission, wherein the turbo HARQ-ACK message indicates a requesteddelta modulation and coding scheme (MCS) for the second downlinktransmission; and transmit, to the UE, the second downlink transmissionbased on the indication of the duplexing mode.
 17. The apparatus ofclaim 16, wherein the first downlink transmission corresponds to a firsttransport block (TB), and the second downlink transmission correspondsto a second TB.
 18. The apparatus of claim 17, wherein the second TBcomprises a retransmission of the first TB or a new TB.
 19. Theapparatus of claim 16, wherein the indication of the duplexing modecorresponds to a full-duplex mode or a half-duplex mode.
 20. Theapparatus of claim 16, wherein the turbo HARQ-ACK message furtherincludes an ACK/negative acknowledgement (NACK) (ACK/NACK) indicationcorresponding to the first downlink transmission.
 21. The apparatus ofclaim 20, wherein the turbo HARQ-ACK message comprises at least 3 bitsincluding one or more first bits for the ACK/NACK indication, one ormore second bits for an indication of the requested delta MCS for thesecond downlink transmission with respect to an MCS associated with thefirst downlink transmission, and one or more third bits for theindication of the duplexing mode.
 22. The apparatus of claim 20, whereinthe turbo HARQ-ACK message is a 2-bit message including a first bit forthe ACK/NACK indication and a second bit for the indication of theduplexing mode.
 23. The apparatus of claim 22, wherein the 2-bit turboHARQ-ACK message further indicates the requested delta MCS for thesecond downlink transmission with respect to an MCS associated with thefirst downlink transmission.
 24. The apparatus of claim 23, wherein therequested delta MCS corresponds to at least one of an MCS increase, anunchanged MCS, or an MCS decrease.
 25. The apparatus of claim 23,wherein the requested delta MCS for the second downlink transmissioncorresponds to a) an MCS increase when the ACK/NACK indicationcorresponds to an ACK and the indication of the duplexing modecorresponds to a full-duplex mode, b) an unchanged MCS when the ACK/NACKindication corresponds to the ACK and the indication of the duplexingmode corresponds to a half-duplex mode, or when the ACK/NACK indicationcorresponds to a NACK and the indication of the duplexing modecorresponds to the full-duplex mode, or c) an MCS decrease when theACK/NACK indication corresponds to the NACK and the indication of theduplexing mode corresponds to the half-duplex mode.
 26. The apparatus ofclaim 16, wherein the first downlink transmission is associated with afull-duplex transmission.
 27. The apparatus of claim 16, wherein theturbo HARQ-ACK message further includes an indication that the turboHARQ-ACK message includes the indication of the duplexing modeassociated with the second downlink transmission.
 28. The apparatus ofclaim 16, the at least one processor being further configured to:transmit, to the UE, a configuration for the turbo HARQ-ACK message. 29.The apparatus of claim 16, further comprising a transceiver coupled tothe at least one processor.
 30. A method of wireless communication at abase station, comprising: receiving, from a user equipment (UE), a turbohybrid automatic repeat request (HARQ)—acknowledgement (ACK) (HARQ-ACK)message corresponding to a first downlink transmission, the turboHARQ-ACK message including an indication of a duplexing mode associatedwith a second downlink transmission, wherein the turbo HARQ-ACK messageindicates a requested delta modulation and coding scheme (MCS) for thesecond downlink transmission; and transmitting, to the UE, the seconddownlink transmission based on the indication of the duplexing mode.